Seiko Cal. 4428 - 316

This Solar model from 1973 features a 40mm Two-Tone case. Powered by the 4428 caliber with 21j jewels beating at 36,000 bph, it delivers a 52 hours power reserve. [seikata-wm-ac542847c7e1]

Also known as: Sumo, Helmet

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

40mm

Case Thickness

9.0mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Cream

Jewels

21j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1973

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